Jar-wrench.



No. 778,884. PATENTE!) JAN. 8, 1905. J. NELSON.

JAR WRENCH.

PYLIOATION FILED .TUNE V17, 1904.

ivo. 7 78,884.

IINTTED STATES Patented January 3, 1905.

PATENT OEEicE.J

JAR-WRENCH.

SPECIFICATION forming part of Letters Patent N o. 778,884, dated January 3, 1905.

Application filed June 17, 1904. Serial No. 213,005.

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Be it known that I, JOHN NELSON, a citizen of the United States, residing at West Bay City, in the county of Bay and State of Michigan, have invented a new and useful .I ar- VVrench, of which the following is a specification.

This invention relates to that class of devices which are generally known as jarwrenches and which are specially constructed for the purpose of tightening screwthreaded caps upon or removing the same from preserving-cans of ordinary construction.

Wrenches heretofore devised for the purpose of manipulating the screw-threaded jarcovers commonly used have usually been objectionable on account of their tendency to grip the cover unevenly, the uneven pressure thus exerted having a tendency to frequently crack the glass or porcelain linings of such covers. This has also been largely due to the fact that wrenches of previous construction have been provided with gripping members overlapping' or crossing the screw-threads of the can-covers, exertinga crushing grip upon the latter, which has been highly objectionable.

The object of the present invention is to present a wrench having a cap-engaging gripping member which shall follow the screwthreads of the cap to be operated upon, said member being provided with a cam-lever whereby it may be tightened upon the cap and whereby suiiicient leverage may be exerted to tighten or to loosen the cap, as may be required.

With these and other ends in view, which will appear as the nature of the invention is better understood, the same consists in the improved construction and novel arrangement and combination of parts, which will be hereinafter fully described, and particularly pointed out in the claim.

In the drawings hereto annexed has been illustrated asimple and preferred form of embodiment of vthe invention, it being, however, understood that no limitation is necessarily made to the precise structural details therein exhibited, but that the right is reserved to any changes, alterations, and modifications to which recourse may be had within the scope of the invention and without departing from the spirit or sacrificing the advantages of the same.

In said drawings, Figure 1 is a perspective view of a jar-wrench constructed in accordance with the principles of the invention. Fig. 2 is a plan view of a wrench with dotted lines showing the position when gripping and tightening force is applied. Fig. 3 is a transverse sectional view taken on the line 3 3 in Fig. 2.

Corresponding partsin the several figures are indicated by similar numerals of reference.

The body 1, which constitutes the gripping member of the wrench, may be cut or stamped from sheet metal of suitable thickness, and it consists of a Hat ring or annulus l of a width greatly exceeding the thickness thereof and having free ends. One of said ends is provided with an obliquely-disposed slot 3, which is almost tangential to the inner circumference of the body member l. An L-shaped handle or lever 4 is pivoted at its heel to the end 5 of the gripping member, and its toe is provided with a pin 6, that projects through the tangential slot 3. The ends 2 and 5 of the body member 1 are connected with opposite sides of the operating-lever, which latter being interposed between the ends serve to space the latter apart vertically. The said ends are also made to overlap each other even when the gripping member is in its expanded position, and the said gripping member will thus be preserved at all times in a continuously and unbroken circular shape. The ends 2 and 5 of the body member l being not only overlapped, as shown, but also spaced apart by the interposed lever member, it will be seen that said body member forms a helix which is adapted to follow the thread formed in the ordinary standard cap of preserving-jars.

By rocking the lever or handle in one direction the body member will be expanded, and may thus be easily fitted upon a cap the thread of which is engaged thereby. By rocking the lever or handle in the opposite direction the body member or gripping member will be tightened evenly upon or around the cap member, which may thus be turned in the desired direction. \at all times be evenly distributed, and the deviee may be quickly and effectively used With- 5 out injury either to the cap or to the cam. Owing to the comparative great Width of the gripping member, the latter will obviously be possessed of great strength and therewill be no danger or possibility of its being ineffect- IO ively or improperly applied.

Having thus described the invention` what is claimed is- In a device of the class described, an annular gripping member having overlapping ends,

'I 5 said gripping member consisting of a at body The pressure Will of a Width greatly exceeding the thickness thereof and one of the ends thereof being provided with an obliquely-disposed slot, in combination With a tightening-lever interposed between the overlapped ends, connected pivotally with one end and having astud extending through the slot in the other end.

`In testimony that I claim the foregoing as my vovvn I have hereto atliXed my signature in the presence of two Witnesses.

JOHN NELSON.

Witnesses:

ARTHUR W. Coon, MICHAEL HAYES. 

